Numerical Modeling of Liquid Droplet Impingement Erosion Considering of Condensation/Liquid Film/Splash and Application for Low Pressure Turbine

在前人侵蚀模型的基础上，建立了液滴撞击侵蚀模型。开发的模型得到了实现。如果冲蚀现象需要较长时间，且时间尺度远长于两相流，则可以采用弱耦合的方法处理两相流与壁面形状的变化。LDIE仿真需要液滴撞击速度和位置，因此选择欧拉-拉格朗日耦合。通过冷凝得到液滴的位置和直径。液膜和溅射是LDI侵蚀过程的重要组成部分，其建模十分复杂。该模型不仅考虑了速度、角度和材料参数，而且考虑了液膜和飞溅。通过对弯曲试验数据的比较，验证了该方法的正确性。在此基础上，对某低压涡轮进行了LDIE仿真，结果与实验数据吻合较好。

A Model of liquid droplet impingement erosion (LDIE) was developed based on previous model of erosion. The developed model was implemented. If the erosion phenomenon requires a long time, and the time scale is much longer than that of the two-phase flow, the changes in the two-phase flow and the wall shape can be treated by weak coupling. LDIE simulation required droplet impingement velocity and position, and so Euler-Lagrange coupling was selected.Condensation was considered to obtain position and diameter of droplets. Liquid film and splash are important for LDI erosion process, the modeling becomes complex. The present model was developed considering not only velocity, angle, and material parameter but also liquid film and splash.The developed procedure was validated by comparing experimental data of bend. Based on the validation, LDIE in a low pressure turbine was simulated, and the present results showed good agreement with experimental data.